C Programming Test 2015

1. What does the argv[0] represent?

Answers:

• The first command line parameter has been passed to the program

• The program name

• The number of command line arguments

• None of the above

2. Read the following two declaration statements.

1. #include <stdio.h>

2. #include "stdio.h"

Which of the following statements pertaining to the above two statements are correct?

Answers:

• For statement 1, the header file will be searched first in the local directory and then in the standard system directories such as "/usr/include"

• For statement 1, the header file will be searched in the standard system directories such as "/usr/include"

• For statement 2, the header file will be searched first in the local directory and then in the standard system directories such as "/usr/include"

• For statement 2, the header file will be searched in the standard system directories such as "/usr/include"

• None of the above

3. Is the following statement correct? If not, why not? If yes, what is the size of the array?  

int array[][3] = { {1,2}, {2,3}, {3,4,2} };

Answers:

• Yes, the size is three columns by two rows

• Yes, the size is two columns by two rows

• No, the first dimension is omitted

• No, one of the three initializer sets contains too many numbers

• Yes, the size is three columns by three rows

4. What will be printed on the standard output as a result of the following code snippet?

void func()

{

    static int i = 1;

    int j = 1;

    i++;

    j++;

    printf("%d %d ",i,j);

}

void main()

{

    func();

    func();

    func();

}

Answers:

• 2 2 2 2 2 2

• 2 2 3 2 4 2

• 2 2 2 3 2 4

• 2 2 3 3 4 4

• None of these

5. Which standard function is used to clear memory allocated by the malloc() function?

Answers:

• free

• calloc

• delete

• elease

• destroy

6. What is the function to concatenate two strings?

Answers:

• strcmp()

• strcpy()

• strcat()

• strlen()

• catstr()

7. Which of the following is not a valid mode for opening a file?

Answers:

• r

• w

• a

• +

• i

8. What will be printed on the standard output as a result of the following code snippet?

void main()

{

        int num1 = 30, num2 = 4;

        float result;

        result = (float)(num1/num2);

        printf("%.2f", result);

        return 0;

}

Answers:

• 7

• 7.00

• 7.000000

• 7.5

• 7.50

9. Study the following code:

    int n = 2;

    int a[n];

What is the error in the above code?

Answers:

• There is no error

• The minimum limit of an array is 5

• The second statement should be placed before the first

• A constant value has to be given in place of a variable for array declaration

10. What is the output of the following program ?

main()

{

int u = 1, v = 3;

printf("%d %d",u,v);

funct1(&u,&v);

printf(" %d %d\n",u,v);

}

void funct1(int *pu, int *pv)

{

*pu=0;

*pv=0;

return;

}

Answers:

• 1 3 1 3

• 1 3 1 1

• 1 3 0 0

• 1 1 1 1

• 3 1 3 1

11. What is wrong with the following statement?

int func();

Answers:

• The function definition {...} is missing

• While calling a function, the type int is not needed

• No parameter has been passed

• The semicolon should not be there

• There is nothing wrong with the statement

12. Suppose there is a file a.dat which has to be opened in the read mode using the FILE pointer ptr1, what will be the correct syntax?

Answers:

• ptr1 = open("a.dat");

• ptr1 = fileopen("a.dat");

• ptr1 = fopen("a.dat","r");

• ptr1 = open("a.dat","r");

• ptr1 = fileopen("a.dat","r");

13. Study the following code where num is an integer array and n is the length of the array:

        for(i=0;i<n-1;i++) 

        { 

                for(j=i+1;j<n;j++) 

                { 

                        if(num[i] > num[j]) 

                        { 

                                var=num[i]; 

                                num[i]=num[j]; 

                                num[j]=var; 

                        } 

                } 

        } 

What does the above code do?

Answers:

• It prints the elements of the array in the ascending orde

• It calculates the sum of the elements of the array

• It sorts the array in the ascending orde

• It sorts the array in the descending orde

• It calculates the average of the elements of the array

14. What will be printed on the standard output as a result of the following code snippet?

void main()

{

        char arr[] = {'R','A','M'};

        printf("%d",strlen(arr));

}

Answers:

• 1

• 3

• 4

• Cannot be determined

15. What will be printed on the standard output as a result of the following code snippet?

void main()

{

    int i,j,k;

    i=4;

    j=30;

    k=0;

    k=j++/i++;

    ++k;

    printf("%d %d %d",i,j,k);

}

Answers:

• 5 31 8

• 5 31 7

• 5 31 6

• 4 30 7

16. Identify the incorrect statement.

Answers:

• Records can be defined in C by using structures

• Structure members can be of the same/different data types

• Memory is reserved when a structure label is defined

• A pointer to a structure can be used to pass a structure to a function

• Arrays of structures can be defined and initialized

17. Given the following array:

int a[8] = {1,2,3,4,5,6,7,0}; 

what would be the output of 

        printf("%d",a[4]); ?

Answers:

• 3

• 4

• 5

• 6

• 7

18. Which function will convert a string into an integer?

Answers:

• int()

• number()

• atoi()

• val()

• tonum()

19. From which of the following loop or conditional constructs, is "break" used for an early exit?

Answers:

• switch

• fo

• while

• do-while

• All of the above

20. What would be printed on the standard output as a result of the following code snippet?

char i = 'A'; 

char *j; 

j = & i; 

*j = *j + 32; 

printf("%c",i);

Answers:

• An error will occur

• a

• A

•

• c

21. What would be printed on the standard output as a result of the following code snippet?

#define func(t, a, b) { t temp; temp=a; a=b; b=temp; }

main()

{

        int a=3, b=4;

        float c=4.5, d = 5.99;

        func(int, a, b);

        func(float, c, d);

        printf("%d %d ", a, b);

        printf("%.2f %.2f\n", c, d); 

}

Answers:

• Results in Compilation Error

• 3 4 5.99 4.50

• 3 4 4.50 5.99

• 4 3 5.99 4.50

• None of the above

22. Given the following array:

        char books[][40]={ 

                         "The Little World of Don Camillo", 

                         "To Kill a Mockingbird", 

                         "My Family and Other Animals", 

                         "Birds, Beasts and Relatives" 

                          }; 

what would be the output of printf("%c",books[2][5]);?

Answers:

• m

• M

• F

• i

• L

23. Given the following array declaration:

        int a[2][3][4] 

what would be the number of elements in array a?

Answers:

• 24

• 22

• 20

• 12

• 36

24. Which function will convert a string into a double precision quantity?

Answers:

• atoi()

• atof()

• atol()

• atan()

• acos()

25. What will be the output of following code?

int main()

   {

      int i;

      i = 0;

      for (i = 1; i <2; i++)

      {

          i++;

          printf( "%d", i );

          continue;

          printf( "%d", i );

      }

      return 0;

   }

Answers:

• 22

• 2,2

• 2

• none of the above

26. What would be printed on the standard output as a result of the following code snippet?

main()

{

int u = 1, v = 3;

printf("%d %d",u,v);

funct1(&u,&v);

printf("%d %d\n",u,v);

}

void funct1(int *pu, int *pv)

{

*pu=0;

*pv=0;

return;

}

Answers:

• 1 31 3

• 1 3 1 1

• 1 30 0

• 1 1 1 1

• 3 1 3 1

27. Which of the following is not a file related function?

Answers:

• fgetc()

• puts()

• fputc()

• fscanf()

• fprintf()

28. What would be printed on the standard output as a result of the following code snippet?

#include<stdio.h>

main()

{

        unsigned char a=255;

        a = a+1;

        printf("%d",a);

        return 0;

}

Answers:

• Undefined value

• 256

• 1

• -1

29. What would be printed on the standard output as a result of the following code snippet?

main()

{

char *pmessage = "asdfgh";

*pmessage++;

printf("%s", pmessage);

return 0;

}

Answers:

• Will result in Compilation Error

• Undefined string

• sdfgh

• asdfgh

30. What would be printed on the standard output as a result of the following code snippet?

#define max(a, b) ((a) > (b)?(a):(b))

main()

{

        int a=4;

        float b=4.5;

        printf("%.2f\n",max(a, b)); 

}

Answers:

• Results in Compilation Error

• Undefined value

• 4.50

• 4.0

• None of the above

31. What will be the output of the following program?

#include <assert.h>

main()

{

int n = 5;

assert(n > 3); //statement 1

n = n+2;

assert(n > 7);//statement 2

return 0;

}

Answers:

• Assertion 'n > 3' failed; Program aborts at statement 1

• Assertion 'n > 7' failed; Program aborts at statement 2

• Program returns 0 with the value of n as 7

• Compilation Error

32. What would be printed on the standard output as a result of the following code snippet?

main()

{

enum {red, green, blue = 6, white};

printf("%d %d %d %d", red, green, blue, white);

return 0;

}

Answers:

• 0 1 6 2

• 0 1 6 7

• Will result in Compilation Error

• None of the above

33. Which file header is to be included for file handling in a C program?

Answers:

• string.h

• file.h

• stdio.h

• stdlib.h

• ctype.h

34. Which function will you use to write a formatted output to the file?

Answers:

• fputc()

• fputs()

• fprintf()

• fseek()

• ftell()

35. Which function returns the current pointer position within a file?

Answers:

• ftell()

• fseek()

• fgetc()

• fread()

• fscanf()

36. Which of the following is not a string function?

Answers:

• strlen()

• strcmp()

• strcpy()

• strrev()

• strcomp()

37. Which of the following declarations of structures is/are valid?

        1) 

                struct node {

                int count;

                char *word;

                struct node next;

                }Node;

        2)

                struct node {

                int count;

                char *word;

                struct node *next;

                }Node;

        3)

                struct node {

                int count;

                char *word;

                union u1 {

                        int n1;

                        float f1;

                }U;

                }Node;

Answers:

• 123

• 12

• 23

• 2

• None of the above

38. What would be printed on the standard output as a result of the following code snippet?

main()

{

int arr[10];

int a = sizeof(arr);

printf("%d\n",a);

return 0;

}

Answers:

• Compilation Error

• 10

• 4

• 40

39. Which of the following is a function for formatting data in memory?

Answers:

• sprintf()

• printf()

• scanf()

• free()

• atol()

40. Which function allocates memory and initializes elements to 0?

Answers:

• assign()

• calloc()

• malloc()

• swab()

• allocate()

41. Given the operators:

1) *

2) /

3) %

What would be the order of precedence?

Answers:

• 1,2,3

• 1,3,2

• 3,2,1

• All have the same precedence

• 1 and 2 have the same precedence, 3 is of lower precedence

42. Which of the following sets of conversion statements may result in the loss of data?

Answers:

• int i; char c; i=c; c=i;

• int i; char c; c=i; i=c;

• int i; float f; i=f; f=i;

• None of the above

43. Which of the following standard functions is used to close a file?

Answers:

• fileclose()

• closefile()

• fclose()

• Any of the above